It turns out you can plug in USB peripherals into the RG350 using a USB-C adapter (which I managed to have lying around). I started plugging various things in and checking dmesg to see what would show up.
Keyboards and mice show up no surprises. It doesn't look like my Griffin or Grid gets detected (also no surprises). USB MIDI seems to be a no-go too (slightly surprising). My XP-PEN drawing tablet *does* show up using generic HID drivers (surprising!)
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